Autonomous Underwater Glider Research
Employer | Agency for Defense Development (ADD) 600 |
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Research Title | The hydrodynamic coefficients estimation for an autonomous underwater glider by vertical planar motion mechanism test |
Research Period | 2013.06 - 2013.10 |
And the analysis techniques of pure heaving motion and pure pitching motion were developed to improve the accuracy of linear hydrodynamic coefficients.
The Underwater Vehicle Research
Employer | The Ministry of National Defense and Agency for Defense Development |
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Research Title | The Underwater Vehicle Research |
Research Period | 2004.04 - 2012.03 ( 8 years ) |
PNU( Pusan National University ) Smml carries out operational covertness of submarine, and on the steering/control performance of guided weapons.
The projects aim to develop core techniques for the optimal hydrodynamic design of underwater vehicles and underwater operational control.
The specific purposes are to study the interactions among body, control plate, and propulsor of underwater vehicles, using computational hydrodynamics, and estimate the hydraulic coefficient for the underwater vehicles with annexes affixed.
This research also seek to establish the nonlinear motion equation and develop the optimal maneuvering and nonlinear control techniques through the study on the optimal motion design techniques for underwater vehicles with nonlinear motion characteristics.
Korea Science and Engineering Foundation's Basic Research Grants
Employer | Korea Science and Engineering Foundation |
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Research Title | Development of Navigation Support System |
Research Period | 2000.9 - 2003.8 ( 3 Years ) |
The scale of Korean shipbuilding industry has been enlarged to premier position in the world. Nevertheless, we see that there are still some problems to be solved from a technical point of view. We aim at breakthrough of ship operation skill by grafting the high-tech knowledge of computer and information science into existing naval architecture engineering. Recently, the environment related with ship operation has grown worse than ever. As an active countermeasure against the worse environment of ship operation, automated navigation support systems have been strongly requested and also have been so much exacted.
Based on this technical background, we aim at developing advanced navigation support systems which will be taken on board. We think that there may be two kinds of navigation support systems. One is for navigation in own seas and the other one for navigation in harbor or coastal wafers. The navigation support systems for use in harbor or coastal wakers will be more necessary and more useful because urgent situation in ship operation may occur more frequently in harbor or coastal waters than in open seas.
For that reason, we confine to developing the navigation support systems related with harbor navigation. We are thinking three sub systems. One is automated collision avoidance system, next one automated anchoring system, and last one real time onboard ship-handling simulator. Automated collision avoidance system is necessary for harbor or coastal navigation. Automated anchoring system is necessary for mooring in harbor or in coastal waters near to harbor especially under severe weather condition. The ship-handling simulator is necessary for training or assessment of harbor navigation or berthing/unberthing manoeuvre.
And also the ship-handling simulator is used for assessment of usefulness, safety and reliability of other navigation support systems before application to real ship operation. We will adopt advanced information engineering such as expert system and genetic algorithm, some well-designed computer graphic tools, and other useful soft-wares for reasoning, visualizing or monitoring of ship behavior.
Research on the Prevent of Marine Accidents of Small Fishing vessels
Employer | Ministry of Maritime Affairs and Fisheries |
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Research Title | Research on the Improvement of Safety to Prevent |
Research Period | 2001.10 - 2002.10 |
Program of Assessment ship maneuver efficiency :
Prediction maneuver efficiency using Principal dimension, Propeller and Rudder before defining Lines. The program that simulates Turning & Zigzag Test with wave force and mediate coefficients presumed by Input Data (Lpp, B, D, T, Cb, Propeller efficiency, Rudder size) will yield Turning Diameter & Overshoot Angle.
Calculation ship maneuvering in wave :
The study is the Calculation method and control equation for assessment ship maneuver. The ship maneuvering will be approximated from the response of steering in steel water and the oscillation of ship in wave, and consider the time domain.
Research for anti-heave of ship body in wave :
The research will be performed with anti-heave method considering wave forces among the method of reducing ship oscillation demanded by sailing and stopping of vessels. The research considering all sorts of special body will apply the method of reducing wave force in heave direction to improve the type of ship.
Ship mooring & anti-crash system using modern control theory :
The computer simulation will verify the algorithm yielded by ship mooring and anti-crash system used the Neural Network and Fuzzy concept. For installing new algorithm to the general ship, this research will carry out with industries.
Korea sea grant Program
Employer | Ministry of Maritime Affairs and Fisheries |
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Research Title | Research on the Improvement of Safety to Prevent Marine Accidents of Fishing Vessels |
Research Period | 2000.12 - 2001.11 (1 year) |
Due to the accumulated data of marine casualties, about 80% are by the fishing vessels, and majority of them are of small size.
Therefore, it is quite important and urgent to analysis the casualties and provide some countermeasures against such casualties. In this report, marine accidents are surveyed and analysis to reach the causes of the accidents.
The most important and traditional parameter representing the stability of a ship is, of course, GM value. But, small fishing vessels under 24m of length are not controlled by the stability rules. In worse cases, they don't have any hydrostatic data and it is hard to calculate the GM through a normal procedure.
In this report, the Background of GM standard and its usefulness are examined carefully, and other factors that affect the safety of fishing vessel are studied.
Assessment of GM using only the principal data of ships, by Genetic Production is carried out. About 10 ships are selected for the real calculated and GM prediction program by Genetic Production is accomplished. This program shows quite good and reliable results in predicting GM of a given ship. Japanese stability rule for small fishing vessel is also applied to calculate GM value, for the comparison with present approach.